Research Progress on TiAl Alloy Prepared by Powder Metallurgy

TiAl alloy are high-profile advanced structural material because of its high strength-to-mass ratio and high service temperature, which has great potential in aerospace, automotive and other fields. However, TiAl alloy has poor thermal workability and is difficult to be formed by traditional methods. Powder metallurgy has a significant advantage in preparing complex TiAl alloy parts due to the characteristics of near-net forming. In recent years, researchers have done a lot of work on sintering technology of TiAl alloy powder and made some progress. The process, microstructure, mechanical properties and parts of TiAl alloy prepared by spark plasma sintering, hot isostatic pressing, hot pressing sintering, spray deposition, injection molding and powder forging in recent years were reviewed. The features and existing problems of above preparation methods were discussed. Meanwhile, some suggestions on powder metallurgy forming TiAl alloy parts and its future development were proposed.